A reverse comedy that tells the story of a perfectionist assassin who falls and hits his head in a sauna, giving him amnesia. When a down-and-out actor switches locker keys with him, they switch lives until the hit-man, who soon becomes an action hero on TV, starts to remember things.
Nam-soo spends a happy new day by marrying his wife, Ji-yun, who fell in love at first sight. Nam-soo, who can't take her eyes off her lovely Ji-yoon, whispers happy love every night. Meanwhile, Nam-soo is embarrassed by the sudden visit of his father, but Ji-yun is greeted like a daughter. Nam-soo, who is saddened by his wife who cares for her father more than herself, tries to understand her actions to feel affection from her father as she hears of Jiyun's unfortunate childhood when she grew up without a father. However, they seem to be so affectionate that they start to doubt the relationship between the two, and as time goes by, the anxiety runs into an irreversible state...
